Zero-voltage ride-through control method for doubly-fed wind generator

Abstract

The invention provides a zero-voltage ride-through control method for a doubly-fed wind generator, and the method comprises the following steps: determining a resistance range of a dynamic active Crowbar hardware protection circuit and performing graded input so as to limit rotor side overcurrent, absorb excess energy and protect a rotor side converter; accelerating the attenuation of a stator flux linkage by improving a flux linkage active attenuation control strategy, so the problem that a double-fed fan is out of control for a long time due to repeated input of a protection circuit is avoided; the DC voltage conversion rate is reduced by improving a grid-side converter control strategy, and the DC bus voltage rapidly tends to be stable when a severe fault occurs; the power captured by awind wheel is reduced to a greater extent within the same time by improving the variable pitch strategy of the doubly-fed wind generator, so the risk of galloping caused by rotor rotating speed risedue to energy imbalance of a fan is reduced; and DStatcom reactive power compensation is added to help to quickly recover the system voltage after the fault. According to the method, the zero-voltageride-through capacity of the doubly-fed wind generator is improved through a comprehensive control method formed through the synergistic effect of the five strategies, and the safe and stable operation of a wind power system is guaranteed and maintained.

Description

technical field [0001] The invention belongs to the field of wind power generation new energy, and in particular relates to a zero-voltage ride-through capability control method of a double-fed wind power generator. Background technique [0002] Energy is the material basis for social development and progress. Since the Industrial Revolution, humans have exploited coal, oil, natural gas and other non-renewable energy on a large scale. Energy issues have become a difficult problem for countries all over the world. With the consumption of fossil energy, the ecological environment is also deteriorating. In order to alleviate the energy crisis, improve fuel utilization and avoid excessive consumption of resources, many countries in the world have taken renewable, non-polluting new clean energy as the focus of sustainable development. As a clean and renewable energy, wind energy has attracted more and more attention from all over the world. Driven by the rapid development of th...

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Problems solved by technology

[0004] Problems to be solved by the technology of the present invention: to overcome the disadvantages of weak real-time adjustment in the prior art, frequent addition of hardware protection devices to increase cost and inconvenience, and successfully realize double-fed wind power generation when a severe voltage drop occurs in the wind power system and the voltage suddenly drops to 0 Generator zero voltage ride through, to ensure and maintain the safe and stable operation of the wind farm power grid

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